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A natural form of learning can increase and decrease the survival of new neurons in the dentate gyrus
Ana Olariu1, Kathryn M Cleaver, Lauren E Shore
1Unit on Neuroplasticity, National Institute of Mental Health, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland 20892, USA.
Hippocampus
|July 13, 2005
Summary
Social transmission of food preference (STFP) learning in rats can enhance or reduce new neuron survival in the hippocampus. Short-term training may protect young cells, while prolonged training leads to their death.
Area of Science:
- Neuroscience
- Cell Biology
- Behavioral Science
Background:
- Adult neurogenesis in the dentate gyrus is crucial for learning and memory.
- Newly born granule cells are highly vulnerable to cell death during their development.
- Previous studies show learning can protect these developing neurons.
Purpose of the Study:
- To investigate the impact of social transmission of food preference (STFP) on the survival of adult-born hippocampal granule cells.
- To determine if STFP learning differentially affects young neuron survival based on training duration.
Main Methods:
- Adult rats were trained using STFP, a natural form of associative learning.
- BrdU labeling was used to track the survival of newly born cells.
- Immunohistochemistry identified pyknotic cells and phospho-Akt expression.
- crmp-4 was used to identify immature neurons.
Main Results:
- STFP training rapidly induced both cell death and cell survival in distinct subsets of young neurons.
- One day of STFP training increased the survival of 8-day-old neurons.
- Two days of STFP training decreased the survival of young neurons and the density of immature neurons.
Conclusions:
- STFP learning exhibits a complex, biphasic effect on adult-born granule cell survival.
- Initial training may promote survival, while extended training leads to cell death.
- This dynamic regulation might optimize neuronal populations for memory consolidation and neurogenesis.